为了解决这一问题，蝙蝠在其肩部附近区域进化出强壮且沉重的骨头，因为这肩部需要更多的支撑。

To solve this problem, bats have evolved strong and heavy bones near their shoulders, where they need more support.

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这来自一个舞蹈和词汇，孤立的能力，也就是说，当肩部移动而头部是不动的，或者跨部运动而肩部不动。

This comes from a dancer's vocabulary, the ability to isolate, say, a shoulder movement from what the head is doing… or hips from the shoulders.

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而从皮肤皱纹来看，这箭头所示的方向，就是肩部及上肢带的主要运动方向。

And from the skin wrinkles, the direction shown by the arrow, is the main direction of movement of the shoulder and upper limb.

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